U.S. patent application number 11/991565 was filed with the patent office on 2009-09-10 for camera-equipped electronic device.
This patent application is currently assigned to NIKON CORPORATION. Invention is credited to Nobuhiro Fujinawa.
Application Number | 20090225190 11/991565 |
Document ID | / |
Family ID | 37962592 |
Filed Date | 2009-09-10 |
United States Patent
Application |
20090225190 |
Kind Code |
A1 |
Fujinawa; Nobuhiro |
September 10, 2009 |
Camera-Equipped Electronic Device
Abstract
A camera-equipped electronic device comprises a photographic
unit that stores in a storage medium (12) an image obtained by
photographing a subject via an imaging unit (14, 15) a
non-photographic unit that executes non-photographing processing
different from photographing processing executed in the
photographic unit and requires electric power greater than the
electric power consumed in the photographing processing, a
decision-making unit (19) that makes a decision as to whether or
not a current state of use is such that if the non-photographic
unit is engaged in operation over a predetermined length of time,
the remaining capacity in a battery (13) will become depleted to a
level equal to or less than a predetermined value and a restricting
unit (19) that restricts the use of the non-photographic unit with
regard to the consumption of electric power based upon the results
of the decision made by the decision-making unit.
Inventors: |
Fujinawa; Nobuhiro;
(Yokohama-shi, JP) |
Correspondence
Address: |
OLIFF & BERRIDGE, PLC
P.O. BOX 320850
ALEXANDRIA
VA
22320-4850
US
|
Assignee: |
NIKON CORPORATION
Tokyo
JP
|
Family ID: |
37962592 |
Appl. No.: |
11/991565 |
Filed: |
October 20, 2006 |
PCT Filed: |
October 20, 2006 |
PCT NO: |
PCT/JP2006/320952 |
371 Date: |
March 6, 2008 |
Current U.S.
Class: |
348/231.2 ;
348/E5.031 |
Current CPC
Class: |
H04N 1/00899 20130101;
H04N 2201/0013 20130101; H04N 21/4184 20130101; H04N 5/232
20130101; H04N 2201/001 20130101; H04N 5/907 20130101; H04N 21/4334
20130101; H04N 2201/0084 20130101; H04N 5/232411 20180801; H04N
5/772 20130101; H04N 21/4223 20130101; H04N 1/00885 20130101; H04N
5/44 20130101; H04N 5/23241 20130101; H04N 5/232939 20180801; H04N
21/4436 20130101 |
Class at
Publication: |
348/231.2 ;
348/E05.031 |
International
Class: |
H04N 5/76 20060101
H04N005/76 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 20, 2005 |
JP |
2005-305807 |
Claims
1. A camera-equipped electronic device, comprising: a photographic
unit that stores in a storage medium an image obtained by
photographing a subject via an imaging unit; a non-photographic
unit that executes non-photographing processing different from
photographing processing executed in the photographic unit and
requires greater electric power than is required by the
photographing processing; a decision-making unit that makes a
decision as to whether or not a current state of use is such that
if the non-photographic unit is engaged in operation over a
predetermined length of time, remaining battery capacity will be
depleted to a level equal to or less than a predetermined value;
and a restricting unit that imposes restrictions on a use of the
non-photographic unit with regard to consumption of the electric
power based upon results of the decision made by the
decision-making unit.
2. A camera-equipped electronic device according to claim 1,
wherein: the decision-making unit includes a detection unit that
detects a state of the storage medium; and the restricting unit
restricts the use of the non-photographic unit with regard to the
consumption of the electric power in correspondence to the detected
state of the storage medium.
3. A camera-equipped electronic device according to claim 2,
wherein: the detection unit detects the presence of the storage
medium loaded in the camera-equipped electronic device; and the
restricting unit restricts the use of the non-photographic unit if
the presence of the storage medium loaded in the camera-equipped
electronic device is not detected.
4. A camera-equipped electronic device according to claim 1,
wherein: the decision-making unit includes a mode selector unit
that selects one of a user mode and a non-user mode; and the
restricting unit restricts the use of the non-photographic unit
when the non-user mode has been selected.
5. A camera-equipped electronic device according to claim 4,
wherein: the decision-making unit includes a detection unit that
detects the presence of the storage medium loaded in the
camera-equipped electronic device; and the restricting unit
restricts the use of the non-photographic unit when the user mode
has been selected and the presence of the storage medium loaded in
the camera-equipped electronic device is detected.
6. A camera-equipped electronic device according to claim 2,
further comprising: a mode selector unit that selects one of a user
mode and a non-user mode, wherein: the detection unit detects the
presence of the storage medium loaded in the camera-equipped
electronic device; and the restricting unit restricts the use of
the non-photographic unit when the user mode has been selected and
the presence of the storage medium loaded in the camera-equipped
electronic device is detected.
7. A camera-equipped electronic device according to claim 2,
further comprising: a mode selector unit that selects one of a user
mode and a non-user mode, wherein: the detection unit includes a
capacity detection unit that detects a remaining storage capacity
available in the storage medium; and when the user mode has been
selected and the detected remaining storage capacity available at
the storage medium is equal to or less than a reference value, the
restricting unit does not restrict the use of the non-photographic
unit, whereas when the non-user mode has been selected, the
restricting unit restricts the use of the non-photographic unit
regardless of the detected remaining storage capacity available at
the storage medium.
8. A camera-equipped electronic device according to claim 1,
wherein: the decision-making unit includes a power supply detection
unit that detects whether or not electric power is being supplied
to the camera-equipped electronic device from an external power
source; and the restricting unit restricts the use of the
non-photographic unit with regard to consumption of the electric
power when the power supply detection unit detects that no electric
power is being supplied to the camera-equipped electronic device
from the external power source.
9. A camera-equipped electronic device according to claim 8,
further comprising: a state detection unit that detects the
presence of the storage medium loaded in the camera-equipped
electronic device, wherein: the restricting unit does not restrict
the use of the non-photographic unit when the state detection unit
does not detect the presence of the storage medium loaded in the
camera-equipped electronic device.
10. A camera-equipped electronic device according to claim 8,
wherein: the restricting unit does not restrict the use of the
non-photographic unit with regard to the consumption of the
electric power when the power supply detection unit detects that
electric power is being supplied from the external power source to
the camera-equipped electronic device.
11. A camera-equipped electronic device according to claim 1,
further comprising: a selection unit that selects one of the
photographic unit and the non-photographic unit, wherein: the
restricting unit imposes restrictions on the use of the
non-photographic unit on condition that the non-photographic unit
has been selected by the selection unit.
12. A camera-equipped electronic device according to claim 1,
wherein: the restricting unit performs one of allowance of the
non-photographic unit to be engaged in operation over only a
predetermined length of time and disallowance of engagement of a
specific function among a plurality of functions of the
non-photographic unit.
13. A camera-equipped electronic device according to claim 1,
wherein: the non-photographic unit is at least one of a television
unit and a projector
Description
TECHNICAL FIELD
[0001] The present invention relates to a camera-equipped
electronic device having functions other than a photographing
function, such as functions of receiving and displaying TV
broadcasts.
BACKGROUND ART
[0002] There are digital cameras known in the related art with
which dynamic images can be displayed at a liquid crystal monitor
included therein. Patent reference literature 1 discloses such a
digital camera with a built-in TV tuner so as to allow the user to
view television broadcasts.
Patent reference literature 1: Japanese Laid Open Patent
Publication No. 2000-23004
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0003] However, the overall electric power consumption, which
increases during television viewing due to the electric power
requirements of the monitor and the IC, is not taken into
consideration in the patent reference literature. More
specifically, it does not address the concern that a prospective
customer checking out the digital camera at a store by displaying a
television broadcast tends to try out the product longer than he
would if he was checking out a camera with only a photographing
function in the related art, leading to an early depletion of the
battery. A similar concern exists with regard to any other digital
camera with a built-in unit that draws significant electric power
such as a projector instead of a television tuner.
Means for Solving the Problems
[0004] A camera-equipped electronic device according to the first
embodiment of this invention comprises a photographic unit that
stores in a storage medium an image obtained by photographing a
subject via an imaging unit; a non-photographic unit that executes
non-photographing processing different from photographing
processing executed in the photographic unit and requires greater
electric power than is required by the photographing processing; a
decision-making unit that makes a decision as to whether or not a
current state of use is such that if the non-photographic unit is
engaged in operation over a predetermined length of time, remaining
battery capacity will be depleted to a level equal to or less than
a predetermined value; and a restricting unit that imposes
restrictions on a use of the non-photographic unit with regard to
consumption of the electric power based upon results of the
decision made by the decision-making unit.
[0005] According to the second aspect of the invention, in the
camera-equipped electronic device according to the first aspect, it
is preferred that the decision-making unit includes a detection
unit that detects a state of the storage medium; and the
restricting unit restricts the use of the non-photographic unit
with regard to the consumption of the electric power in
correspondence to the detected state of the storage medium.
[0006] According to the third aspect of the invention, in the
camera-equipped electronic device according to the second aspect,
it is preferred that the detection unit detects the presence of the
storage medium loaded in the camera-equipped electronic device; and
the restricting unit restricts the use of the non-photographic unit
if the presence of the storage medium loaded in the camera-equipped
electronic device is not detected.
[0007] According to the fourth aspect of the invention, in the
camera-equipped electronic device according to the first aspect, it
is preferred that the decision-making unit includes a mode selector
unit that selects one of a user mode and a non-user mode; and the
restricting unit restricts the use of the non-photographic unit
when the non-user mode has been selected.
[0008] According to the fifth aspect of the invention, in the
camera-equipped electronic device according to the fourth aspect,
it is preferred that the decision-making unit includes a detection
unit that detects the presence of the storage medium loaded in the
camera-equipped electronic device; and the restricting unit
restricts the use of the non-photographic unit when the user mode
has been selected and the presence of the storage medium loaded in
the camera-equipped electronic device is detected.
[0009] According to the sixth aspect of the invention, in the
camera-equipped electronic device according to the second aspect,
it is preferred that there is further provided: a mode selector
unit that selects one of a user mode and a non-user mode, and the
detection unit detects the presence of the storage medium loaded in
the camera-equipped electronic device; and the restricting unit
restricts the use of the non-photographic unit when the user mode
has been selected and the presence of the storage medium loaded in
the camera-equipped electronic device is detected.
[0010] According to the seventh aspect of the invention, in the
camera-equipped electronic device according to the second aspect,
it is preferred that there is further provided a mode selector unit
that selects one of a user mode and a non-user mode, and the
detection unit includes a capacity detection unit that detects a
remaining storage capacity available in the storage medium; and
when the user mode has been selected and the detected remaining
storage capacity available at the storage medium is equal to or
less than a reference value, the restricting unit does not restrict
the use of the non-photographic unit, whereas when the non-user
mode has been selected, the restricting unit restricts the use of
the non-photographic unit regardless of the detected remaining
storage capacity available at the storage medium.
[0011] According to the eighth aspect of the invention, in the
camera-equipped electronic device according to the first aspect, it
is preferred that the decision-making unit includes a power supply
detection unit that detects whether or not electric power is being
supplied to the camera-equipped electronic device from an external
power source; and the restricting unit restricts the use of the
non-photographic unit with regard to consumption of the electric
power when the power supply detection unit detects that no electric
power is being supplied to the camera-equipped electronic device
from the external power source.
[0012] According to the ninth aspect of the invention, in the
camera-equipped electronic device according to the eighth aspect,
it is preferred that there is further provided a state detection
unit that detects the presence of the storage medium loaded in the
camera-equipped electronic device, and the restricting unit does
not restrict the use of the non-photographic unit when the state
detection unit does not detect the presence of the storage medium
loaded in the camera-equipped electronic device.
[0013] According to the tenth aspect of the invention, in the
camera-equipped electronic device according to the eighth or the
ninth aspect, it is preferred that the restricting unit does not
restrict the use of the non-photographic unit with regard to the
consumption of the electric power when the power supply detection
unit detects that electric power is being supplied from the
external power source to the camera-equipped electronic device.
[0014] According to the eleventh aspect of the invention, in the
camera-equipped electronic device according to any of the first
through the tenth aspect, it is preferred that there is further
provided a selection unit that selects one of the photographic unit
and the non-photographic unit, and the restricting unit imposes
restrictions on the use of the non-photographic unit on condition
that the non-photographic unit has been selected by the selection
unit.
[0015] According to the twelfth aspect of the invention, in the
camera-equipped electronic device according to any of the first
through the eleventh aspect, it is preferred that the restricting
unit performs one of allowance of the non-photographic unit to be
engaged in operation over only a predetermined length of time and
disallowance of engagement of a specific function among a plurality
of functions of the non-photographic unit.
[0016] According to the thirteenth aspect of the invention, in the
camera-equipped electronic device according to any of the first
through the twelfth aspect, it is preferred that the
non-photographic unit is at least one of a television unit and a
projector.
Effect of the Invention
[0017] According to the present invention, early depletion of the
battery can be prevented.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 External views of a TV tuner-equipped digital camera
with a according to the present invention, with (a) presenting a
top view and (b) presenting a rear view
[0019] FIG. 2 A block diagram of the TV tuner-equipped digital
camera according to the present invention
[0020] FIG. 3 A flowchart of the operations executed in the TV
tuner-equipped digital camera in a first embodiment of the present
invention
[0021] FIG. 4 A flowchart of the operations executed in the TV
tuner-equipped digital camera in a second embodiment of the present
invention
[0022] FIG. 5 A block diagram of a projector-equipped digital
camera according to the present invention
[0023] FIG. 6 A flowchart of the operations executed in the
projector-equipped digital camera according to the present
invention
[0024] FIG. 7 A flowchart of the operations executed in the TV
tuner-equipped digital camera in a fourth embodiment of the present
invention
[0025] FIG. 8 A block diagram of the essential structure adopted in
a TV tuner/projector-equipped digital camera according to the
present invention
[0026] FIG. 9 A flowchart of the operations executed in the TV
tuner/projector-equipped digital camera
[0027] FIG. 10 A block diagram of the essential structure adopted
in the TV tuner-equipped digital camera in a sixth embodiment of
the present invention
[0028] FIG. 11 A flowchart of the operations executed in the TV
tuner-equipped digital camera in the sixth embodiment of the
present invention
BEST MODE FOR CARRYING OUT THE INVENTION
[0029] The following is an explanation of embodiments of the TV
tuner-equipped digital camera according to the present invention
with the TV tuner thereof representing an example of a
non-photographic unit having a significant electric power
requirement, given in reference to FIGS. 1 through 4.
First Embodiment
[0030] FIG. 1 provides external views of the TV tuner-equipped
digital camera according to the present invention and FIG. 2
provides a block diagram of the TV tuner-equipped digital camera.
An object of the first embodiment is to limit the length of time
over which a television broadcast can be viewed at a retail shop.
The digital camera is judged to be in a retail store mode when a
memory card is loaded therein. The TV tuner-equipped digital camera
has a digital camera function and a TV tuner function. It is to be
noted that the elements engaged in operation primarily to fulfill
these functions are collectively referred to as a digital camera
unit and a TV tuner unit.
[0031] The digital camera unit includes a lens 14, an image sensor
15, a typical example of which is a CCD sensor or a CMOS sensor, a
shutter release button switch 10 operated by the user, a cross key
18 operated by the user to select various settings, an built-in
memory 16 where a captured image is temporarily stored, an overall
control unit 19 that includes a CPU and its peripheral circuits
engaged in operation to execute various types of photographing
control and execute image composite processing to be detailed
later, a liquid crystal monitor 11 at which a reproduced
photographic image, a through image or various settings menus are
displayed with a backlight (not shown), and a memory card slot 12a
at which a memory card 12 having saved therein captured images
together with image capturing time information indicating times
counted via a time counter circuit 102. It is to be noted that the
liquid crystal monitor 11 may be constituted with a light emitting
element such as an organic EL (electroluminescence) element. A
memory card 12 may assume any form as long as it is a recording
medium that can be detachably loaded into the camera body.
Reference numeral 13 indicates a battery, reference numeral 31
indicates an A/D conversion circuit, reference numeral 32 indicates
a correction circuit, reference numeral 33 indicates a memory,
reference numeral 34 indicates a card I/F and reference numeral 35
indicates an external I/F. It is to be noted that a signal (card
detection signal) indicating the presence/absence of a card in the
memory card slot 12a is input to the overall control unit 19 via
the card I/F 34. At the rear surface of the TV tuner-equipped
digital camera, a menu button 100 operated to bring up a setting
menu at the liquid crystal monitor 11 and a display button 101
operated to bring up on display at the liquid crystal monitor 11
the newest photographic image most recently stored in the built-in
memory 16, are disposed.
[0032] The TV tuner unit includes a tuner 21, an antenna 22, a
processing circuit 23 that digitally processes the video signal in
a received television broadcast, a speaker 26 through which the
television broadcast sound is output and an amplifier 25 that
amplifies the sound. The TV tuner unit shares with the digital
camera unit the overall control unit 19 which also executes various
types of control related to the television broadcast, the liquid
crystal monitor 11 at which the received television image is
displayed, and the cross key 18. It is to be noted that an
operation unit 20 in FIG. 2 represents various operation members
including the cross key 18. In a camera mode, the cross key 18 is
used as the zoom button and the like, whereas it is used in a
television mode for selecting a channel and adjusting the volume.
The operation unit 20 in this embodiment includes a mode selector
switch 24 with which a changeover operation is performed to change
over from the "camera mode" to the "television mode" and vice
versa.
[0033] The following is an explanation of the operations executed
in the TV tuner-equipped digital camera according to the present
invention, given in reference to the flowchart presented in FIG. 3.
The individual processing procedures shown in FIG. 3 are executed
based upon a program by the overall control unit 19. The program
based upon which the various types of processing in FIG. 3 is
executed is stored in a memory (not shown) and is started up in
response to an operation signal input via the mode selector switch
24.
[0034] As a negative decision is made with regard to "television
mode selected?" in step S1 in FIG. 3, i.e., if it is decided that
the "camera mode" has been set at the mode selector switch 24
through a user operation, the operation proceeds to step S2. In
step S2, various types of processing are executed to allow the TV
tuner-equipped digital camera to function as a digital camera.
[0035] In the camera mode, a subject light flux transmitted through
the lens 14 forms an image at the light receiving surface of the
image sensor 15, which, in turn, outputs an image signal
corresponding to the intensity of the light constituting the
subject image. The image signal is then converted to a digital
signal at the A/D conversion circuit 31 and undergoes various types
of image processing at the correction circuit 32 to generate image
data. The image data thus generated are stored into the memory 33
used as a primary buffer. The image data stored in the memory 33
are compressed as necessary and are recorded into the built-in
memory 16 used as a secondary buffer. If a memory card 12, i.e., a
recording medium, is loaded, the photographic image data are
transferred from the built-in memory 16 and recorded into a memory
card 12.
[0036] A photographic image is reproduced by transferring the
corresponding image data recorded in the built-in memory 16 or a
memory card 12 to a VRAM 17 and bringing up the image corresponding
to the image data on display at the liquid crystal monitor 11 under
control executed by the overall control unit 19. In addition, in a
photographing standby state, image data obtained by photographing
an image over a predetermined time interval are recorded into the
built-in memory 16 and are also transferred by the overall control
unit 19 to the VRAM 17 so as to bring up a real time display of the
image corresponding to the image data at the liquid crystal monitor
11. As a result, the photographer is able to view the subject as a
dynamic image at the liquid crystal monitor 11. It is to be noted
that the VRAM 17, which functions as a buffer memory where the
image data used for display of a reproduced image at the liquid
crystal monitor 11 are held, has a capacity for storing image data,
the volume of which corresponds to the number of pixels at the
liquid crystal monitor 11.
[0037] If an affirmative decision is made in step S1 in FIG. 3,
i.e., if it is decided that the "television mode" has been set at
the mode selector switch 24 through a user operation, the operation
proceeds to step S3. If an affirmative decision is made with regard
to "memory card loaded?" in step S3, i.e., if it is decided that a
memory card 12 is loaded based upon a card detection signal
received via the card I/F 34, the operation proceeds to step S4. In
step S4, various types of processing are executed so as to allow
the TV tuner-equipped digital camera to function as a television
tuner alone.
[0038] In the television mode, television signals are received at
the tuner 21 from the antenna 22 and a sound signal and a video
signal are output. The sound signal is amplified at the amplifier
25 and is then output through the speaker 26. The video signal
undergoes digital processing for display at the processing circuit
23. The video signal having undergone the digital processing for
display is temporarily saved as video data into the built-in memory
16 or a memory card 12, and is also transferred by the overall
control unit 19 to the VRAM 17. The video image corresponding to
the video data is then brought up on display at the liquid crystal
monitor 11. It is to be noted that channel selection at the tuner
21 is controlled by the overall control unit 19 based upon the
results of an operation at the cross key 18.
[0039] If a negative decision is made in step S3, i.e., if it is
decided that no memory card 12 is loaded, the operation proceeds to
step S5. In step S5, the television broadcast received as described
above is stored into the built-in memory 16 and the video image is
displayed at the liquid crystal monitor 11 via the VRAM 17. The
operation then proceeds to step S6. It is to be noted that a timer
is started up in step S5 to limit the length of time over which the
TV broadcast is to be received.
[0040] In step S6, the length of time having been counted at the
timer is read and the length of time that has elapsed following the
television broadcast reception start is detected. If an affirmative
decision is made in step S6, i.e., if it is decided that a
predetermined length of time has elapsed following the television
broadcast reception start, the operation proceeds to step S7. If,
on the other hand, a negative decision is made in step S6, i.e., if
it is decided that the predetermined length of time has not elapsed
following the television broadcast reception start, the operation
returns to step S5 to continuously receive the television broadcast
and display the television broadcast at the liquid crystal monitor
11. The predetermined length of time may be approximately "30
seconds", which maybe selected as a default value or the time may
be selected at the retail shop by subsequently modifying the
default value. An upper limit is set to the length of time that may
be selected at the retail shop in adherence to the concept of the
present invention of limiting battery consumption.
[0041] In step S7 to which the operation proceeds when the
predetermined length of time elapses following the television
broadcast reception start, a message such as "demonstration mode
display ending" is brought up on display over a specific length of
time at the liquid crystal monitor 11. The operation then proceeds
to step S8 to turn off the display at the liquid crystal monitor
11, thereby ending the series of processing.
[0042] The following advantage is achieved in the TV tuner-equipped
digital camera in the first embodiment of the present invention
described above. Namely, depending upon the loaded/unloaded state
of a memory card 12, the overall control unit 19 imposes
restrictions on the use of electric power at the TV tuner unit,
i.e., a non-photographic unit, that executes non-photographing
processing distinguishable from photographing processing. Namely,
if a memory card 12 is not loaded in the camera body, the overall
control unit 19 imposes restrictions with regard to the length of
time over which the television broadcast can be received. As a
result, excessive battery power consumption is prevented. The
present invention is particularly effective in preventing
television broadcast display over an excessively long period of
time while a prospective customer considers the pros and cons of
the potential purchase since the demonstration model at a retail
shop is not likely to have a memory card 12 loaded therein as a
theft deterrent measure and the like. It is to be noted that the
demonstration model will be able to provide full digital camera
performance via the built-in memory 16 even when a memory card 12
is not loaded.
Second Embodiment
[0043] The second embodiment of the present invention is now
described. The TV tuner-equipped digital camera achieved in the
second embodiment includes components identical to those of the TV
tuner-equipped digital camera in the first embodiment shown in
FIGS. 1 and 2. In the TV tuner-equipped digital camera in the
second embodiment set in the television mode via the mode selector
switch 24, the overall control unit 19 displays at the liquid
crystal monitor 11 a demonstration dynamic image stored in advance
in the built-in memory 16 if it detects no memory card 12 is
loaded. When the demonstration dynamic image has been on display
over a predetermined length of time, e.g., 30 seconds, the overall
control unit 19 turns off the liquid crystal monitor 11.
[0044] The following is an explanation of the operations executed
in the TV tuner-equipped digital camera in the second embodiment,
given in reference to the flowchart presented in FIG. 4. The
individual processing procedures shown in FIG. 4 are executed based
upon a program by the overall control unit 19. The program based
upon which the various types of processing in FIG. 4 is executed is
stored in a memory (not shown) and is started up in response to an
operation signal input via the mode selector switch 24. It is to be
noted that the same processing step numbers are assigned to steps
in which processing identical to that in the flowchart in FIG. 3 is
executed so as to preclude the need for a repeated explanation
thereof.
[0045] If it is decided in step S3 in FIG. 4 that no memory card 12
is loaded, the operation proceeds to step S9. In step S9, a
demonstration dynamic image similar to a television broadcast,
stored in advance in the built-in memory 16, is displayed at the
liquid crystal monitor 11 instead of receiving and displaying a
television broadcast, and then the operation proceeds to step S6.
As in step S5 described in reference to FIG. 3, the timer for
restricting the length of time over which the TV tuner-equipped
digital camera is to engage in television operation is started up
in step S9. It is to be noted that the dynamic image may be a
sample television program or a television commercial. This dynamic
image can also be brought up on display in the regular operation
mode.
[0046] The following advantages are achieved in the TV
tuner-equipped digital camera in the second embodiment described
above. When no memory card 12 is loaded in the camera body, the
overall control unit 19 displays the demonstration dynamic image
similar to a received television broadcast instead of actually
receiving a television broadcast. Thus, the consumption of electric
power at the IC used in the television broadcast reception circuit
is minimized. In addition, as in the first embodiment, the length
of time over which the dynamic image remains on display at the
liquid crystal monitor 11 is restricted to a predetermined time
length by the overall control unit 19 if no memory card 12 is
loaded in the camera body and thus, excessive battery power
consumption is prevented through the second embodiment as well. The
second embodiment is particularly effective in preventing
television broadcast display over an excessively long period of
time while a prospective customer considers the pros and cons of
the potential purchase since the demonstration model at a retail
shop is not likely to have a memory card 12 loaded therein as a
theft deterrence measure and the like. It is to be noted that the
demonstration model will be able to provide full digital camera
performance via the built-in memory 16 even when a memory card 12
is not loaded.
Third Embodiment
[0047] Next, a projector-equipped digital camera achieved in an
embodiment of the present invention, with the projector
representing an example of the non-photographic unit with
significant electric power requirements, is explained in reference
to FIGS. 5 and 6.
[0048] FIG. 5 presents a block diagram of the projector-equipped
digital camera achieved in the third embodiment. The
projector-equipped digital camera has a projector function and a
digital camera function. It is to be noted that the elements
engaged in operation primarily to fulfill these functions are
collectively referred to as the digital camera unit and the
projector unit. The structure of the digital camera unit is
identical to that of the digital camera unit in the TV
tuner-equipped digital camera described above. It is to be noted
that the mode selector switch 24 at the operation unit 20 is
operated to change over from "the camera mode" to the "projector
mode" and vice versa.
[0049] The projector unit includes a projection lens 41, a liquid
crystal panel 42, an LED light source 43, an LED drive unit 44, a
liquid crystal drive unit 45 and a lens drive unit 46. The LED
drive unit 44 supplies an electrical current to the LED light
source 43 in response to an LED drive signal output from the
overall control unit 19. The LED light source 43 illuminates the
liquid crystal panel 42 with brightness, the level of which
corresponds to the current supplied thereto. The quantity of light
from the LED light source 43 can be manually adjusted via a control
dial or the like (not shown). It is to be noted that the projector
unit is used to project an image corresponding to image data stored
in a memory card 12 or the built-in memory 16 onto a screen (not
shown). In addition, if the projector-equipped digital camera
further includes the antenna 22, the tuner 21 and the processing
unit 23 having been described in reference to the first embodiment
and the second embodiment and is thus capable of receiving
television broadcasts, a received television broadcast can be
projected via the projector unit.
[0050] The following is an explanation of the operations executed
in the projector-equipped digital camera in the embodiment, given
in reference to the flowchart presented in FIG. 6. The individual
processing procedures shown in FIG. 6 are executed based upon a
program by the overall control unit 19. The program based upon
which the various types of processing in FIG. 6 is executed is
stored in a memory (not shown) and is started up in response to an
operation signal input via the mode selector switch 24.
[0051] If an affirmative decision is made with regard to "projector
mode selected?" in step S21 in FIG. 6, i.e., if it is decided that
the "projector mode" has been set at the mode selector switch 24,
the operation proceeds to step S23. In step S23, a decision is made
as to whether or not a memory card 12 is loaded based upon a
detection signal provided from the card I/F 34. If an affirmative
decision is made in step S23, i.e., if it is decided that a memory
card 12 is loaded, the operation proceeds to step S24 to execute
various types of processing to allow the projector-equipped digital
camera to function as a projector only. It is to be noted that if a
negative decision is made in step S21, i.e., if it is decided that
the "camera mode" has been set at the mode selector switch 24, the
operation proceeds to step S2 to execute various types of
processing to allow the projector-equipped digital camera to
function as a digital camera only, as explained earlier.
[0052] In the projector mode, the overall control unit 19 reads out
image data stored in a memory card 12. The liquid crystal drive
unit 45 generates a liquid crystal panel drive signal in
correspondence to the image data thus read out and drives the
liquid crystal panel 42 with the generated drive signal. More
specifically, it applies a voltage to the liquid crystal layer for
each pixel in correspondence to the image signal. As the voltage is
thus applied, the arrangement of the liquid crystal molecules
changes at the liquid crystal layer, altering the transmittance of
light at the liquid crystal layer. By modulating the light from the
LED light source 43 in correspondence to the image signal as
described above, the liquid crystal panel 42 generates a light
image.
[0053] Based upon a control signal output from the overall control
unit 19, the lens drive unit 46 drives the projection lens 41 so
that it advances/retreats along the optical axis. The light image
emitted from the liquid crystal panel 42 is projected via the
projection lens 41 toward the screen or the like.
[0054] If a negative decision is made in step S23, i.e., if it is
decided that no memory card 12 is loaded, the operation proceeds to
step S25. In step S25, a projector operation is started up as in
step S24 to project the demonstration image, before the operation
proceeds to step S26. As described earlier in reference to step S5
in FIG. 3, a timer is started up in step S25 to impose restrictions
on the length of time over which the projector-equipped digital
camera is to operate as a projector. It is to be noted that the
demonstration image is a sample image stored in advance in the
built-in memory 16.
[0055] In step S26, the length of time having been counted on the
timer is read and a decision is made as to whether or not a
predetermined length of time has elapsed following the start of the
projection via the projector. If an affirmative decision is made in
step S26, i.e., if it is decided that the predetermined length of
time has elapsed following the projection start, the operation
proceeds to step S27. If, on the other hand, a negative decision is
made in step S26, i.e., if it is decided that the predetermined
length of time has not elapsed following the projection start, the
operation returns to step S25 to continuously project the
demonstration image via the projector. The setting for the
predetermined length of time is selected as has been explained
earlier.
[0056] In step S27 to which the operation proceeds when the
predetermined length of time elapses following the projection
start, a message such as "demonstration mode display ending" is
brought up on display over a specific length of time at the screen
and the liquid crystal monitor 11. The operation then proceeds to
step S28 to turn off the LED light source 33 so as to end the
series of processing by ending the projection via the projector. It
is to be noted that the message may remain on display at the liquid
crystal monitor 11 over a specific length of time after the
projection via the projector ends.
[0057] It is to be noted that the battery power consumption can be
further reduced by applying the following restrictions when no
memory card is loaded in a projector that allows manual adjustment
of the light source brightness.
(1) Disallow a light source brightness adjusting operation. Or, set
an upper limit value and disallow adjustment to the maximum
brightness level. (2) Adjust to the standard brightness level first
and then disallow brightness adjustment if the maximum brightness
level is currently selected for the light source brightness.
[0058] The following advantage is achieved in the
projector-equipped digital camera in the third embodiment described
above. If no memory card 12 is loaded, the overall control unit 19
restricts the length of time over which the projector is allowed to
engage in projection to the predetermined length of time, e.g., 30
seconds. Excessive battery power consumption is thus prevented. The
third embodiment is particularly effective in preventing projection
over an excessively long period of time while a prospective
customer considers the pros and cons of the potential purchase
since the demonstration model at a retail shop is not likely to
have a memory card 12 loaded therein as a theft deterrence measure
and the like. It is to be noted that the demonstration model will
be able to provide full digital camera performance via the built-in
memory 16 even when a memory card 12 is not loaded.
Fourth Embodiment
[0059] The fourth embodiment of the present invention is now
described in reference to FIG. 7. The TV tuner-equipped digital
camera achieved in the fourth embodiment includes components
identical to those of the TV tuner-equipped digital camera in the
first embodiment shown in FIGS. 1 and 2.
[0060] A mode changeover is executed to switch camera functions for
the camera use at the retail shop or for the camera use by a user
having purchased the camera by turning on/off a hidden switch in
the TV tuner-equipped digital camera in the fourth embodiment. A
non-user mode is selected when the hidden switch is in an ON state
so as to impose restrictions on the length of time over which a
television broadcast can be received. When the TV tuner-equipped
digital camera is handed over to a purchasing user, the mode
setting is turned off, thereby switching to the user mode. Once the
user purchases the camera, the overall control unit 19 adjusts the
restriction imposed on the length of time over which a television
broadcast can be received at the TV tuner unit in correspondence to
whether or not a memory card is loaded.
[0061] The hidden switch may be constituted with, for instance, the
shutter release button switch 10, the menu button 100 and the
display button 101, disposed at different surfaces. For instance,
the hidden switch may enter an ON state after the shutter release
button switch 10, the menu button 100 and the display button 101
are continuously held down simultaneously for 10 seconds, so as to
shift into an operation mode in which the use of the TV tuner unit
is restricted. This operation mode is the non-user mode selected
when the TV tuner-equipped digital camera is displayed at a retail
shop or the like, as described earlier. As the shutter release
button 10, the menu button 100 and the display button 101 are held
down together in this state for 10 seconds, the hidden switch
enters an OFF state to shift into the user mode, i.e., the regular
operation mode in which the user operates the TV tuner-equipped
digital camera. A decision as to whether or not to shift into the
user mode or the non-user mode is made by the overall control unit
19. Since the operation mode shifts into the non-user mode only if
the operation members disposed at different surfaces are operated
simultaneously over a predetermined length of time (e.g., 10
seconds), the TV tuner-equipped digital camera is never allowed to
inadvertently shift from the user mode to the non-user mode due to
a plurality of operation members becoming depressed in a specific
position at which the camera is held.
[0062] In addition, by constituting the hidden switch with
operation members that are only operated in operation modes
different from one another (e.g., individually in the photographing
mode and the display mode), such as the shutter release button 10,
which is operated only in the photographing mode and a reproduced
image frame feed switch, which is operated only in the display
mode, the risk of the camera mode shifting into the non-user mode
due to an inadvertent operation can be further reduced. By assuming
a structure in which the operation described above is accepted only
when the time information output by the time counter circuit 102
indicates a time before the retail shop opening time, e.g., a time
between 8 a.m. and 8:10 a.m., an inadvertent shift between the
non-user mode and the user mode can be reliably prevented.
[0063] When the hidden switch is in the ON state, the overall
control unit 19 sets the TV tuner-equipped digital camera in the
non-user mode. In the non-user mode, as a signal indicating that
the television mode has been selected is input from the mode
selector switch 24, the overall control unit 19 restricts the
length of time over which a television broadcast can be received at
the TV tuner unit, i.e., a non-photographic unit, to a
predetermined length of time, e.g., 30 seconds. In other words,
when the thirty-second period elapses following the start of the
television image display at the liquid crystal monitor 11, the
overall control unit 19 ends the operation by the TV tuner unit and
turns off the liquid crystal monitor 11.
[0064] When the hidden switch described above is in the OFF state,
the overall control unit 19 sets the TV tuner-equipped digital
camera in the user mode. Upon receiving from the mode selector
switch 24 a signal indicating that the television mode has been
selected, the overall control unit 19 verifies whether or not a
memory card 12 is loaded. If a memory card 12 is not loaded, i.e.,
if no card detection signal is input via the card I/F 34, the
overall control unit 19 does not impose any restrictions with
regard to the length of time over which television broadcasts can
be received. If, on the other hand, a memory card 12 is loaded,
i.e., if a card detection signal is input from the card I/F 34, the
overall control unit 19 imposes the restrictions so as to limit the
television broadcast reception time to the predetermined length of
time, i.e., 30 seconds. In other words, when the thirty-second
period elapses following the start of the television image display
at the liquid crystal monitor 11, the overall control unit ends the
operation by the TV tuner unit and turns off the liquid crystal
monitor 11.
[0065] The following is an explanation of the operations executed
in the TV tuner-equipped digital camera in the fourth embodiment,
given in reference to the flowchart presented in FIG. 7. The
individual processing procedures shown in FIG. 7 are executed based
upon a program by the overall control unit 19. The program based
upon which the various types of processing in FIG. 7 is executed is
stored in a memory (not shown) and is started up in response to an
operation signal input via the mode selector switch 24.
[0066] In step S101, a decision is made as to whether or not the
hidden switch has been turned on. If the hidden switch is in the ON
state, an affirmative decision is made in step S101 and the
operation proceeds to step S102. If, on the other hand, the hidden
switch is in the OFF state, a negative decision is made in step
S101 and the operation proceeds to step S110.
[0067] In step S102, a decision is made as in step S1 in FIG. 3 as
to whether or not the television mode has been selected via the
mode selector switch 24. If the television mode has been selected,
an affirmative decision is made in step S102 and the operation
proceeds to step S104. The processing executed in step S104
(television broadcast reception/display) through step S107 (monitor
off) is similar to the processing executed in step S5 (television
broadcast reception/display) through step S8 (monitor off) in FIG.
3. If the camera mode has been selected, a negative decision is
made in step S102 and the operation proceeds to step S103. In step
S103, various types of processing are executed to allow the TV
tuner-equipped digital camera to function as a digital camera, as
in step S2 in FIG. 3.
[0068] In step S108, to which the operation proceeds after making a
negative decision in step S101, a decision is made as in step S102
as to whether or not the television mode has been selected. If the
television mode has been selected, an affirmative decision is made
in step S108 and the operation proceeds to step S109. If the camera
mode has been selected, a negative decision is made in step S102
and the operation proceeds to step S110. In step S110, various
types of processing are executed to allow the TV tuner-equipped
digital camera to function as a digital camera, as in step
S103.
[0069] In step S109, a decision is made as to whether or not a
memory card 12 is loaded. If a memory card 12 is loaded, i.e., if a
card detection signal is input from the card I/F 34, an affirmative
decision is made in step S109 and the operation proceeds to step
S112. The processing executed in step S112 (television broadcast
reception/display) through step S115 (monitor off) is similar to
the processing executed in step S104 (television broadcast
reception/display) through step S107 (monitor off). If no memory
card 12 is loaded, a negative decision is made in step S109 and the
operation proceeds to step S111. In step S111, the image of the
television broadcast received at the TV tuner 21 is displayed at
the liquid crystal monitor 11, as in step S4 in FIG. 3.
[0070] The following advantages are achieved in the TV
tuner-equipped digital camera in the fourth embodiment of the
present invention described above.
(1) When the hidden switch is in the ON state and the TV
tuner-equipped digital camera is set in the non-user mode, the
overall control unit 19 imposes restrictions with regard to the use
of the TV tuner unit, i.e., a non-photographic unit by limiting the
length of time over which the TV tuner unit is allowed to receive
television broadcast. Since this prevents television display over
an unnecessarily long period of time while a prospective customer
is trying out the camera set in the non-user mode at a retail
store, battery power is not consumed to an excessive extent. (2)
When the hidden switch is in the OFF state and the TV
tuner-equipped digital camera is set in the user mode, the overall
control unit 19 upon detecting that a memory card 12 is loaded,
imposes restrictions on the use of the TV tuner unit by limiting
the length of time over which the TV tuner unit is allowed to
receive television broadcast. When a memory card 12 is loaded in
the TV tuner-equipped digital camera set in the user mode, the user
is likely to use the camera to photograph a subject. Since the
non-photographic unit cannot be used over an extended period of
time under such circumstances, excessive battery power consumption
is prevented so as to ensure that sufficient battery power is
available for the photographic unit operation while photographing
the subject.
Fifth Embodiment
[0071] In reference to FIGS. 8 and 9, the TV
tuner/projector-equipped digital camera achieved in the fifth
embodiment of the present invention is described. FIG. 8 shows the
essential structure of the TV tuner/projector-equipped digital
camera, the external appearance of which is identical to that shown
in FIG. 1. It is to be noted that the same reference numerals are
assigned to components identical to those of the TV tuner-equipped
digital cameras and the projector-equipped digital camera achieved
in the first through fourth embodiment. The mode selector switch 24
at the operation unit 20 can be operated to select the "television
mode", the "projector mode" or the "camera mode". Of these, the
"projector mode" and the "television mode" can be selected at the
same time. At this dual-mode setting, the video image of a
television broadcast received at the tuner 21 can be projected via
the projector unit. The "camera mode", on the other hand, is never
selected in combination with the "projector model" or the
"television mode".
[0072] As does the TV tuner-equipped digital camera in the fourth
embodiment, the TV tuner/projector-equipped digital camera in the
fifth embodiment includes a hidden switch. When the hidden switch
is in the ON state, i.e., when the non-user mode has been selected,
restrictions are imposed with regard to the length of time over
which the TV tuner unit and the projector unit can be used. When
the hidden switch is in the OFF state, i.e., in the user mode, the
overall control unit 19 adjusts the restrictions imposed with
regard to the length of time over which the TV tuner unit and the
projector unit can be used, depending upon whether or not a memory
card is loaded.
(1-1) Non-User Mode, Television Mode
[0073] When the hidden switch is in the ON state, the overall
control unit 19 sets the TV tuner/projector-equipped digital camera
in the non-user mode. As a signal indicating that the television
mode has been selected is input from the mode selector switch 24 in
the non-user mode, the overall control unit 19 drives the TV tuner
unit to receive a television broadcast at the tuner 21. At this
time, the overall control unit 19 stops the electric power supply
to the projector unit. The overall control unit 19 displays the
video image of the received television broadcast at the liquid
crystal monitor 11. The overall control unit 19 limits the length
of time over which the television broadcast is received to a
predetermined length of time set at 30 seconds. Thus, when 30
seconds elapses following the video image display start, the
overall control unit 19 stops driving the TV tuner unit.
(1-2) Non-User Mode, Projector Mode
[0074] As a signal indicating that the projector mode has been
selected is input from the mode selector switch 24 in the non-user
mode, the overall control unit 19 drives the projector unit. In
addition, the overall control unit 19 drives the TV tuner unit so
as to receive a television broadcast via the tuner 21. The overall
control unit 19 projects the video image of the received television
broadcast via the projector unit and also outputs the sound of the
received television broadcast through the speaker 26. The overall
control unit 19 also limits the length of time over which the
television image is projected to a predetermined length of time set
at 30 seconds. Namely, when 30 seconds elapses following the
television image projection start, the overall control unit 19
turns off the LED light source 43 and stops driving the projector
unit. It also stops driving the TV tuner unit.
(2-1) User Mode, Television Mode
[0075] When the hidden switch is in the OFF state, the overall
control unit 19 sets the TV tuner/projector-equipped digital camera
in the user mode. As a signal indicating that the television mode
has been selected is input from the mode selector switch 24 in the
user mode, the overall control unit 19 drives the TV tuner unit.
The overall control unit 19 also adjusts the restrictions imposed
with regard to the use of the TV tuner unit, i.e., a
non-photographic unit, in correspondence to whether or not a memory
card 12 is loaded. At this time, the overall control unit 19 stops
the electric power supply to the projector unit.
(2-2-1) When No Memory Card is Loaded
[0076] When no memory card 12 is loaded, i.e., when no card
detection signal is input from the card I/F 34, the overall control
unit 19 displays the television broadcast image at the liquid
crystal monitor 11 and outputs the sound through the speaker 26. In
this situation, the overall control unit 19 does not impose any
restrictions with regard to the length of time over which the
television broadcast can be received.
(2-2-2) When a Memory Card is Loaded
[0077] When a memory card 12 is loaded, i.e., when a card detection
signal is input from the card I/F 34, the overall control unit 19
displays the television broadcast image at the liquid crystal
monitor 11 and outputs the sound through the speaker 26. In this
situation, however, the overall control unit 19 imposes
restrictions so as to limit the length of television broadcast
reception to a predetermined length of time set at 30 seconds.
Namely, when 30 seconds elapses following the television image
display start, the overall control unit 19 stops driving the TV
tuner unit.
(2-2) User Mode, Projector Mode
[0078] As a signal indicating that the projector mode has been
selected is input from the mode selector switch 24 in the user
mode, the overall control unit 19 drives the projector unit. The
overall control unit 19 also adjusts the restrictions imposed with
regard to the use of the projector unit, i.e., a non-photographic
unit, in correspondence to whether or not a memory card 12 is
loaded.
(2-2-1) When No Memory Card 12 is Loaded
[0079] When no memory card 12 is loaded, i.e., when no card
detection signal is input from the card I/F 34, the overall control
unit 19 makes a decision as to whether or not the television mode
has been selected. If the television mode has been selected, the
overall control unit 19 drives the TV tuner unit to receive a
television broadcast at the tuner 21. Then, the overall control
unit 12 projects the video image of the received television
broadcast via the projector unit and also outputs the sound through
the speaker 26. At this time, the overall control unit 19 does not
impose any restrictions with regard to the use of the projector
unit. If, on the other hand, the television mode is not currently
selected, the overall control unit 19 turns off the LED light
source 43 and stops driving the projector unit. Namely, it does not
project the television image via the projector unit under these
circumstances.
(2-2-2) When the Memory Card is Loaded
[0080] When the TV tuner/projector-equipped digital camera loaded
with a memory card 12 is set in the television mode via the mode
selector switch 24, the overall control unit drives the TV tuner
unit to receive a television broadcast via the tuner 21. The
overall control unit 19 then projects the image of the received
television broadcast via the projector unit and outputs the sound
through the speaker 26. If, on the other hand, the television mode
has not been selected via the mode selector switch 24, the overall
control unit 19 reads out image data stored in a memory card 12.
The overall control unit 19 then projects the image corresponding
to the image data having been read out via the projector unit. When
the predetermined length of time, set at 30 seconds, elapses
following the image projection start, the overall control unit 19
turns off the LED light source 43 and stops driving the projector
unit. In other words, the overall control unit 19 imposes
restrictions with regard to the length of time over which the
projector unit can be utilized. It is to be noted that if the
television mode has also been selected in the TV
tuner/projector-equipped digital camera, the overall control unit
19 stops driving the TV tuner unit.
[0081] The following is an explanation of the operations executed
in the TV tuner/projector-equipped digital camera in the fifth
embodiment, given in reference to the flowchart presented in FIG.
9. The individual processing procedures shown in FIG. 9 are
executed based upon a program by the overall control unit 19. The
program based upon which the various types of processing in FIG. 9
is executed is stored in a memory (not shown) and is started up in
response to an operation signal input via the mode selector switch
24.
[0082] In step S201, a decision is made as to whether or not the
hidden switch has been turned on. If the hidden switch is in the ON
state, an affirmative decision is made in step S201 and the
operation proceeds to step S202. If, on the other hand, the hidden
switch is in the OFF state, a negative decision is made in step
S201 and the operation proceeds to step S213.
[0083] In step S202, a decision is made as to whether or not the
projector mode has been selected. If a signal indicating that the
projector mode has been selected is input from the mode selector
switch 24, an affirmative decision is made in step S202 and the
operation proceeds to step S209. In step S209, the image of the
television broadcast received at the tuner 21 is projected via the
projector unit and then the operation proceeds to step S210. The
processing executed in step S210 (decision-making as to whether or
not the predetermined length of time has elapsed) through step S212
(light source off) is similar to the processing executed in step
S26 (decision-making as to whether or not the predetermined length
of time has elapsed) through step S28 (light source off) in FIG.
6.
[0084] If no signal indicating that the projector mode has been
selected is input from the mode selector switch 24, a negative
decision is made in step S202 and the operation proceeds to step
S203. The processing executed in step S203 (decision-making as to
whether or not the television mode has been selected) through step
S208 (monitor off) is similar to the processing executed in step
S102 (decision-making as to whether or not the television mode has
been selected) through step S107 (monitor off) in FIG. 7.
[0085] In step S213, to which the operation proceeds when the
hidden switch is in the OFF state, a decision is made as to whether
or not the projector mode has been selected. If a signal indicating
that the projector mode has been selected is input from the mode
selector switch 24, an affirmative decision is made in step S213
and the operation proceeds to step S222. If, on the other hand, no
signal indicating that the projector mode has been selected is
input from the mode selector switch 24, a negative decision is made
in step S213 and the operation proceeds to step S214.
[0086] The processing executed in step S214 (decision-making as to
whether or not the television mode has been selected) through step
S221 (monitor off) is similar to the processing executed in step
S108 (decision-making as to whether or not the television mode has
been selected) through step S115 (monitor off) in FIG. 7.
[0087] In step S222, a decision is made as to whether or not a
memory card 12 is loaded. If a card detection signal is input from
the card I/F 34, an affirmative decision is made in step S222 and
the operation proceeds to step S225. In step S225, the image of the
television broadcast received at the tuner 21 or the image
corresponding to image data read out from a memory card 12 is
projected via the projector unit before the operation proceeds to
step S226. The processing executed in step S226 (decision-making as
to whether or not the predetermined length of time has elapsed)
through step S228 (light source off) is similar to the processing
executed in step S26 (decision-making as to whether or not the
predetermined length of time has elapsed) through step S28 (light
source off) in FIG. 6.
[0088] If no card detection signal is input from the card I/F 34, a
negative decision is made in step S222 and the operation proceeds
to step S223. In step S223, a decision is made as to whether or not
the television mode has been selected. If a signal indicating that
the television mode has been selected is input from the mode
selector switch 24, an affirmative decision is made in step S223
and the operation proceeds to step S224. In step S224, the image of
the television broadcast received at the tuner 21 is projected via
the projector unit as in step S209. If, on the other hand, no
signal indicating that the television mode has been selected is
input from the mode selector switch 24, a negative decision is made
in step S223 and the operation proceeds to step S228.
[0089] The following advantages are achieved in the TV
tuner/projector-equipped digital camera in the fifth embodiment of
the present invention described above.
(1) When the hidden switch is in the ON state in the TV
tuner/projector-equipped digital camera set in the non-user mode,
the overall control unit 19 imposes restrictions on the length of
time over which the TV tuner unit, i.e., a non-photographic unit,
is allowed to receive a television broadcast or the length of time
over which the projector unit, i.e., a non-photographic unit can be
engaged in image projection. Thus, by setting the TV
tuner/projector-equipped digital camera on display at a retail shop
in the non-user mode, the length of time over which a television
broadcast can be displayed or an image can be projected while a
prospective customer checks out the TV tuner/projector-equipped
digital camera can be restricted to prevent excessive battery power
consumption.
[0090] When the hidden switch is in the OFF state and the TV
tuner/projector-equipped digital camera is set in the user mode,
the overall control unit 19 upon detecting that a memory card 12 is
loaded, imposes restrictions on the length of time over which the
TV tuner unit is allowed to receive a television broadcast or the
length of time over which the projector unit can be engaged in
image projection. When a memory card 12 is loaded in the TV
tuner/projector-equipped digital camera in the user mode, the user
is likely to use the camera to photograph a subject. Since a
non-photographic unit cannot be used over an extended period of
time under such circumstances, excessive battery power consumption
is prevented so as to ensure that sufficient battery power is
available for the photographic unit operation while photographing
the subject.
Sixth Embodiment
[0091] In reference to FIGS. 10 and 11, the TV tuner-equipped
digital television achieved in the sixth embodiment of the present
invention is described by focusing on its difference from the TV
tuner-equipped digital camera in the first embodiment. FIG. 10 is a
block diagram showing the essential structure adopted in the TV
tuner-equipped digital camera assuming an external appearance
identical to that shown in FIG. 1. As shown in the block diagram in
FIG. 10, it includes a cradle detection unit 37 that detects the
resting state when the camera is set on a cradle 37.
[0092] When the TV tuner-equipped digital camera achieved in the
sixth embodiment is placed on the cradle 37, i.e., when it is
connected to an AC power source via the cradle 37, the overall
control unit 19 does not impose any restrictions with regard to the
length of time over which a television broadcast can be received
regardless of whether or not a memory card 12 is loaded. When the
TV tuner-equipped digital camera is not placed on the cradle 37,
the overall control unit 19 imposes restrictions on the length of
time over which a television broadcast can be received upon
detecting that a memory card 12 is loaded via the card I/F 34. If
the TV tuner-equipped digital camera is not placed on the cradle 37
and the presence of a memory card 12 is not detected, the overall
control unit 19 does not impose any restrictions on the length of
time over which a television broadcast can be received.
[0093] The following is an explanation of the operations executed
in the TV tuner-equipped digital camera in the embodiment given in
reference to the flowchart presented in FIG. 11. The individual
processing procedures shown in FIG. 11 are executed based upon a
program by the overall control unit 19. The program based upon
which the various types of processing in FIG. 11 is executed is
stored in a memory (not shown) and is started up in response to an
operation signal input via the mode selector switch 24.
[0094] In step S301, the state of the camera with regard to whether
or not it is currently placed on the cradle 37 is detected. If a
resting state signal is input from the cradle detection unit 36, an
affirmative decision is made in step S301 and the operation
proceeds to step S302. In step S302, a decision is made as to
whether or not the camera mode has been selected. If the camera
mode has been selected, an affirmative decision is made in step
S302 and the operation proceeds to step S303. In step S303,
processing similar to that executed in step S2 in FIG. 3 is
executed before ending the series of processing. If the television
mode has been selected, a negative decision is made in step S302
and the operation proceeds to step S304.
[0095] In step S304, processing similar to that executed in step S4
in FIG. 3 is executed before ending the series of processing.
[0096] If, on the other hand, no resting state signal is input from
the cradle detection unit 36, a negative decision is made in step
S301 and the operat ion proceeds to step S305. The processing
executed in step S305 (decision-making as to whether or not the
television mode has been selected) through step S312 (monitor off)
is similar to that executed in step S108 (decision-making as to
whether or not the television mode has been selected) through step
S115 (monitor off) in FIG. 7.
[0097] The following advantages are achieved in the TV
tuner-equipped digital camera in the sixth embodiment described
above.
(1) Upon detecting that no electric power is currently supplied via
the cradle 37, i.e., an external power source, the overall control
unit 19 imposes restrictions with regard to the length of time over
which a television broadcast can be received at the TV tuner unit,
which is a non-photographic unit. Thus, since a television
broadcast cannot be displayed over an extended period of time
unless electric power is being supplied from the external power
source, excessive battery power consumption is prevented. (2) If
the presence of the memory card is not detected while no electric
power is being received from the cradle 37, the overall control
unit 19 does not impose any restrictions with regard to the length
of time over which a television broadcast can be received at the TV
tuner unit, i.e., a non-photographic unit. If there is no memory
card 12 loaded in the camera while no electric power is being
received from the external power source, the user is not likely to
be using the camera to photograph a subject. Since the need to
secure the electric power required in the photographic unit
operations to photograph the subject is thus eliminated, the
non-photographic unit can be utilized anytime the user desires
under these circumstances. (3) If it is detected that the electric
power is being supplied from the cradle 37, the overall control
unit 19 does not impose any restrictions on the use of the TV tuner
unit, i.e., a non-photographic unit. When the camera is placed on
the cradle 37, it is connected via the cradle 37 to the AC power
source and thus, the battery power in the battery within the camera
does not need to be used. This means that even if the
non-photographic unit is engaged in operation over an extended
period of time, excessive consumption of battery power does not
occur, allowing the user to utilize the non-photographic unit as he
wishes.
[0098] The embodiments described above allow for the following
variations.
(1) Instead of restricting the use of a non-photographic unit
depending upon whether or not a memory card 12 is loaded in the
digital camera, the overall control unit 19 may limit the use of
the non-photographic unit based upon the remaining storage capacity
available in a memory card 12. In such a case, the overall control
unit 19 should make a decision as to whether or not information
indicating the remaining storage capacity available in a memory
card 12, input via the card I/F 34, indicates a value equal to or
less than a predetermined reference value. If the remaining storage
capacity at a memory card 12 is equal to or less than the
predetermined reference value when the hidden switch is in the OFF
state or the camera is not currently resting on the cradle 37, the
overall control unit 19 does not need to impose restrictions on the
use of the non-photographic unit. When the hidden switch is in the
ON state or the camera is currently resting on the cradle 37, the
overall control unit 19 does not need to restrict the use of the
non-photographic unit regardless of the available storage capacity
at a memory card 12.
[0099] If the camera includes a built-in memory and thus does not
require a memory card 12, the overall control unit 19 may restrict
the use of the non-photographic unit based upon the available
storage capacity in the built-in memory. In such a case, the
overall control unit 19 will need to detect the remaining storage
capacity at the built-in memory. Then, the overall control unit 19
will make a decision as to whether or not the detected remaining
storage capacity at the built-in memory is equal to or less than a
predetermined reference value. If the remaining storage capacity at
the built-in memory is equal to or less than the predetermined
reference value when the hidden switch is in the OFF state or the
camera is not currently resting on the cradle 37, the overall
control unit 19 will not need to impose restrictions on the use of
the non-photographic unit. When the hidden switch is in the ON
state or the camera is currently resting on the cradle 37, the
overall control unit 19 will not need to restrict the use of the
non-photographic unit regardless of the available storage capacity
at the built-in memory.
(2) While an explanation is given above on examples in which the
digital camera is equipped with a non-photographic unit with
significant electric power requirements such as a TV tuner or a
projector, a unit with significant electric power requirements is
not limited to a TV tuner or a projector. For instance, the present
invention maybe adopted when the digital camera is equipped with a
monitor or a unit with significant IC power requirements such as a
portable video game unit or a communication device. In other words,
the present invention can be adopted in various types of electronic
devices equipped with cameras.
[0100] It is to be noted that while an explanation is given above
on specific embodiments and variations thereof, the present
invention is not limited to their particular details and it will be
understood by those skilled in the art that various changes in form
and detail may be made therein without departing from the scope and
teaching of the invention. Namely, as long as the electric power
consumption at a non-photographic unit that uses more electric
power than the electric power required for camera operations is
controlled, any other restrictions apart from the restrictions on
the length of time or the restrictions on the mode of use, may be
imposed. For instance, if the non-photographic unit has a plurality
of functions with varying electric power requirements, an operation
with particularly large electric power requirements maybe
disallowed. Under such circumstances, restrictions may be imposed
on the length of time over which an operation with relatively small
electric power requirements can be executed or an operation that
does not require significant electric power consumption may be
executed without restrictions.
[0101] The disclosure of the following priority application is
herein incorporated by reference:
* * * * *